package com.openread.tools;

import java.io.Writer;

import com.thoughtworks.xstream.XStream;
import com.thoughtworks.xstream.core.util.QuickWriter;
import com.thoughtworks.xstream.io.HierarchicalStreamWriter;
import com.thoughtworks.xstream.io.xml.PrettyPrintWriter;
import com.thoughtworks.xstream.io.xml.XppDriver;

public class XStreamFactory {
    protected static String PREFIX_CDATA = "<![CDATA[";
    protected static String SUFFIX_CDATA = "]]>";

    /**
     * 初始化XStream 可支持某一字段可以加入CDATA标签 如果需要某一字段使用原文
     * 就需要在String类型的text的头加上"<![CDATA["和结尾处加上"]]>"标签， 以供XStream输出时进行识别
     * 
     * @param isAddCDATA 是否支持CDATA标签
     * @return
     */
    public static XStream init(boolean isAddCDATA) {
        XStream xstream = null;
        if (isAddCDATA) {
            xstream = new XStream(new XppDriver() {
                public HierarchicalStreamWriter createWriter(Writer out) {
                    return new PrettyPrintWriter(out) {
                        protected void writeText(QuickWriter writer, String text) {
                            if (!text.startsWith(PREFIX_CDATA)) {
                                text = PREFIX_CDATA + text + SUFFIX_CDATA;
                            }
                            writer.write(text);
                        }
                    };
                };
            });
        } else {
            xstream = new XStream();
        }
        return xstream;
    }
}
